2
What is Water Pollution? any physical (temperature, oxygen), chemical (mercury), or biological (disease, sewage) change to water that adversely effects its use by living things

3
Cuyahoga River, Ohio November 1952 Some river! Chocolate- brown, oily, bubbling with subsurface gases, it oozes rather than flows. "Anyone who falls into the Cuyahoga does not drown," Cleveland's citizens joke grimly. "He decays.” Time Magazine, August 1969

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Clean Water Act Established water quality standards 2.System for ID’ing point sources 3.Pretreatment for industry 4.Federal funding for sewage treatment 5.Provided for enforcement Worked well for point sources Nonpoint sources still a problem